• INDIAN POLITY FOR CIVIL SERVICES EXAMINATIONS
  • Indian Culture for Prelims Preparation
  • Environment and Ecology
  • Economics
  • Geography
  • Science & Technology
  • Indian History
  • Current Affairs

Environment Issues

  1. Air Pollution and Its Control
  2. Water Pollution and Its Control
  3. Solid Wastes
  4. Agrochemicals and their Effects
  5. Radioactive Wastes
  6. Greenhouse Effect and Global Warming
  7.  Ozone Depletion in the Stratosphere
  8. Degradation by Improper Resource Utilisation and Maintenance
  9. Deforestation
  1. NCERT Biology Class XII-Chapter 16
  2. NCERT Chemistry- Class XI- Chapter 14
  3. NCERT- Class VIII- Science- Chapter 18

[2011 Prelims]

1)Human activities in the recent past have caused the increased concentration  of carbon dioxide in the atmosphere, but a lot of it does not remain in the lower atmosphere because of  ?

  1.    Its escape into the outer stratosphere.
  2.    The photosynthesis by phytoplankton in the oceans.
  3.    The trapping of air in the polar ice caps.

Which of the statements given above is/are correct   ?

(a)    1 and 2.

(b)    2 only.

(c)    2 and 3.

(d)    3 only.

2) The formation of the ozone hole in the Antarctic region has been a cause of concern. What could be the reason for the formation of this hole ?

(a)    The presence of prominent tropo­spheric turbulence; and inflow of

chlorofluorocarbons.

(b)    Presence of prominent polar front and stratospheric clouds;

and inflow of chlorofluorocarbons.

(c)    The absence of polar front and stratospheric clouds; and inflow of

methane and chlorofluorocarbons.

(d)    Increased temperature at polar region due to global warming.

3)Salinization occurs when the irrigation water accumulated in the soil evapo­rates, leaving behind salts and minerals. What are the effects of Salinization  on the irrigated land ?

(a)    It greatly increases the crop production.

(b)    It makes some soils  impermeable .

(c)    It raises the water table.

(d)    It fills the air spaces in the soil with water.

4) Consider the following :

  1.    Carbon dioxide.
  2.    Oxides of nitrogen.
  3.    Oxides of Sulphur

4)Which of the above is/are the emission/emissions from coal combustion at thermal power plants ?

(a)    1 only.

(b)    2 and  3 only.

(c)    1 and 3 only.

(d)    1,2,and 3

5)There is a concern over the increase in harmful algal blooms in the seawater of India. What could be the causative factors for this phenomenon ?

  1.    Discharge of nutrients from the estuaries.
  2.    Run­off from the land during the monsoon.’
  3.    Upwelling in the seas.

Select the correct answer from the codes given below :

(a)    1 only.

(b)    1 and  2 only.

(c)    2  and 3 only.

(d)    1,2,and 3.

[2012 Prelims]

1)Chlorofluorocarbons, known as ozone depleting substances are used

  1. In the production of plastic foams
  2.  In the production of tubeless tyres
  3. In cleaning certain electronic components
  4. As pressurizing agents in aerosol cans

Which of the statements given above is/are correct?

a. 1,2 and 3 only

b.  4 only

c. 1, 3 and 4 only

d 1, 2, 3 and 4

[2013 Prelims]

1)Photochemical smog is a resultant of the reaction among

(a) NO2, 03 and peroxyacetyl nitrate in the presence of sunlight

(b) CO, 02 and peroxyacetyl nitrate in the presence of sunlight

(c) CO, CO2, and N02 at low temperature

(d) High concentration of N02, O3, and CO in the evening

2)Acid rain is caused by the pollution of environment by

(a) carbon dioxide and nitrogen

(b) carbon monoxide and carbon dioxide

(c) ozone and carbon dioxide

(d) nitrous oxide and sulphur dioxide

3)Which of the following can be found as pollutants in the drinking water in some parts of India?

  1. Arsenic
  2. Sorbitol
  3. Fluoride
  4. Formaldehyde
  5. Uranium

Select the correct answer using the codes given below.

(a) 1 and 3 only

(b) 2, 4 and 5 only

(c) 1, 3 and 5 only

(d) 1, 2, 3, 4 and 5

4)Due to improper / indiscriminate disposal of old and used computers or their parts, which of the following are released into the environment as e-­waste?

  1. Beryllium
  2. Cadmium
  3. Chromium
  4. Heptachlor
  5. Mercury
  6. Lead
  7. Plutonium

Select the correct answer using the codes given below.

(a) 1, 3, 4, 6 and 7 only

(b) 1, 2, 3,5 and 6 only

(c) 2, 4, 5 and 7 only

(d) 1, 2, 3, 4, 5, 6 and 7

[2014 Prelims]

1)Which of the following are some important pollutants released by the steel industry in India?      

  1. Oxides of sulphur                 
  2. Oxides of nitrogen                 
  3. Carbon monoxide                 
  4. Carbon dioxide

Select the correct answer using the code given below.

(a) 1, 3 and 4 only                 

(b) 2 and 3 only                 

(e) 1 and 4 only                 

(d) 1,2, 3 and 4

2)In India, the problem of soil erosion is associated with which of the following?

  1. Terrace cultivation
  2. Deforestation
  3. Tropical climate’

Select the correct answer using the code given below.

(a) I and 2 only

(b) 2 only

(c) 1 and 3 only

(d) 1, 2 and 3

[2015 Prelims]

1)What can be the impact of the excessive/ inappropriate use of nitrogenous fertilizers in agriculture?

  1. The proliferation of nitrogen-fixing microorganisms in soil can occur.
  2. the increase in the acidity of soil can take place.
  3. Leaching of nitrate to the groundwater can occur.

Select the correct answer using the code given below.

(a) 1 and 3 only

(b) 2 only

(c) 2 and 3 only

(d) 1, 2 and 3

[2017 Prelims]

1)In the context of mitigating the impending global warming due to anthropogenic emissions of carbon dioxide, which of the following can be the potential sites for carbon sequestration?

  1. Abandoned and uneconomic coal seams
  2. Depleted oil and gas reservoirs
  3. Subterranean deep saline formations

Select the correct answer using the code given below:

(a) 1 and 2 only

(b) 3 only

(c) 1 and 3 only

(d) 1, 2 and 3

Answer: D

2)In the context of solving pollution problems, what is/are the advantage/advantages of bioremediation technique?

  1. It is a technique for cleaning up pollution by enhancing the same biodegradation process that occurs in nature.
  2. Any contaminant with heavy metals such as cadmium and lead can be readily and completely treated by bioremediation using microorganisms.
  3. Genetic engineering can be used to create microorganisms specifically designed for bioremediation.

Select the correct answer using the code given below:

(a) 1 only

(b) 2 and 3 only

(c) 1 and 3 only

(d) 1, 2 and 3

Answer: C

3) Biological Oxygen Demand (BOD) is a standard criterion for

(a) Measuring oxygen levels in blood

(b) Computing oxygen levels in forest ecosystems

(c) Pollution assay in aquatic ecosystems

(d) Assessing oxygen levels in high altitude regions

Answer: C